Proof of unapproved tenants

[Bobby Beard]

As a landlord or PM how do you document unapproved tenants? How would you build your case to file in court to evict based on multiple unapproved tenants of one of your properties? For example, I have a 3/1 that I rented to a lady with 2 grown kids (18 and 21). She then moved in another girl (18) and her little brother (13ish) bc they had no where to go. Then her daughters BF stays a "couple nights" a week.